The cause of infant respiratory distress syndrome is a lack of ____
a. oxygen
b. carbon dioxide
c. hemoglobin
d. surfactant
e. surface tension
ANSWER: d
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If a plant species exhibits maternal inheritance for leaf pigmentation, what is the phenotype of the parents of a variegated (green and white leaves) plant?
A. The maternal plant must be white and the paternal plant must be green. B. The maternal plant must be green and the paternal plant must be white. C. The maternal plant must be variegated and the paternal plant can be any color. D. Both the maternal and paternal plant must be variegated. E. The maternal plant must be variegated and the paternal plant must be white.
Because it has no aquaporins, water is generally trapped in the ____ in mammals
a. distal convoluted tubule b. Bowman's capsule c. descending segment of the loop of Henle d. proximal convoluted tubule e. ascending segment of the loop of Henle
What is found in the ventral horn of the spinal cord?
a. dendrites b. cell bodies of motor neurons c. axons d. white matter tracts e. autonomic neurons
GABA receptors play an essential role in neurotransmission in the central nervous system. In response to the appropriate signal, these receptors open up and allow Cl- to flow into the cell. Given this information, GABA receptors can be classified as a
A. gated ion channel. B. gated carrier protein. C. Cl- pump. D. symporter.